By using attributes encoded in the network data model, such as road type, each segment can be displayed to reflect its importance. For instance, the above cartographic representation of a network data model displays three road classes (highway, main street, and street) differently. Descriptive labels for the most important elements and directional signs for one-ways have also been added. To enrich the cartographic message, additional layers of information have been added, namely landmarks. Nodal attributes can also have a cartographic utility, such as displaying if an intersection has traffic lights.